Agricultural system for field preparation

ABSTRACT

An agricultural system includes a tow bar for attachment to a towing vehicle in a trailing position relative to a direction of movement along a field. The system includes a plurality of row-cleaning devices attached in parallel strip positions along the tow bar. Each row-cleaning device has a rigid frame, a leading coulter, one or more furrow-opener disks, and a pivotable row-cleaning linkage. The disks have a leading edge adjacent to a trailing edge of the coulter. The row-cleaning linkage is attached to the rigid frame, with the coulter and disks being coupled to the rigid frame via the row-cleaning linkage. The system further includes a roller device between two adjacent parallel strip positions and attached at each end to a respective rigid frame via a respective pivotable roller linkage. The roller linkage is independently movable relative to the row-cleaning linkage.

FIELD OF THE INVENTION

The present invention relates generally to agricultural equipment and,more particularly, to a system having a roller device for preparing afield with leftover residual plant matter.

BACKGROUND OF THE INVENTION

As plant matter is leftover on a field from one season to the next,farming operations continue to struggle with residual stubble whenpreparing the field for a new crop. These challenges are especiallyevident in no-till farming, which has become more popular over therecent years. For example, planting seeds between rows of leftover cornstalks is difficult without removing or minimizing the presence of thecorn stalks in the planted rows.

Thus, it would be desirable to develop a system that overcomes theproblems and limitations associated with leftover residual plant matter.

SUMMARY OF THE INVENTION

In accordance with one embodiment, an agricultural system includes a towbar for attachment to a towing vehicle in a trailing position relativeto a direction of movement along a field. The system further includes aplurality of row-cleaning devices attached in parallel strip positionsalong the tow bar, and at least one roller device. Each row-cleaningdevice includes a rigid frame for attachment to the tow bar, a leadingcoulter, and one or more furrow-opener disks. The furrow-opener disksare in a trailing position relative to the leading coulter, each of thefurrow-opener disks having a leading edge adjacent to a trailing edge ofthe leading coulter. Each row-cleaning device further includes apivotable row-cleaning linkage attached to the rigid frame, the leadingcoulter and the furrow-opener disks being coupled to the rigid frame viathe pivotable row-cleaning linkage. The roller device extends betweentwo adjacent parallel strip positions and is attached at each end to arespective rigid frame via a respective pivotable roller linkage. Thepivotable roller linkage is independently movable relative to thepivotable row-cleaning linkage.

In accordance with another embodiment, an agricultural system includes atow bar for attachment to a towing vehicle in a trailing positionrelative to a direction of movement along a field. The system furtherincludes a plurality of row-cleaning devices attached in parallel strippositions along the tow bar, the plurality of row-cleaning devicesincluding a first row-cleaning device and a second row-cleaning device.The first row-cleaning device is attached in a first strip position andincludes a first rigid frame for attachment to the tow bar, a firstleading coulter, and one or more first furrow-opener disks in a trailingposition relative to the first leading coulter. The first row-cleaningdevice includes a first pivotable row-cleaning linkage attached to thefirst rigid frame, the first leading coulter and the first furrow-openerdisks being coupled to the first rigid frame via the first pivotablerow-cleaning linkage. The second row-cleaning device is attached in asecond strip position, the second strip position being adjacent andparallel to the first strip position, the second row-cleaning deviceincluding a second rigid frame for attachment to the tow bar, a secondleading coulter, one or more second furrow-opener disks in a trailingposition relative to the second leading coulter. The second row-cleaningdevice further includes a second pivotable row-cleaning linkage attachedto the second rigid frame, the second leading coulter and the secondfurrow-opener disks being coupled to the second rigid frame via thesecond pivotable row-cleaning linkage. The system further includes aroller device attached between the first row-cleaning device and thesecond row-cleaning device, the roller device including a firstpivotable roller linkage attached at a first end of the roller deviceand being independently movable from the first rigid frame. The rollerdevice further includes a second pivotable roller linkage attached at asecond end of the roller device and being independently movable from thesecond rigid frame, and at least one roller bearing mounted along arotational axis of the roller device.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention may best be understood by reference to the followingdescription taken in conjunction with the accompanying drawings.

FIG. 1 is a perspective view of an agricultural system having a rollerdevice and a row-cleaning device.

FIG. 2A is a top view of the agricultural system of FIG. 1.

FIG. 2B is a top view of the agricultural system of FIG. 1 illustratedwith an optional roller device attached instead of the row-cleaningdevice.

FIG. 3 is a side view of the agricultural system of FIG. 1 without therow-cleaning device.

FIG. 4 is a front view of the agricultural system of FIG. 1 without therow-cleaning device.

FIG. 5 is a side view of the agricultural system of FIG. 1.

FIG. 6 is a front view diagrammatic illustrating roller devices having asingle central roller bearing.

FIG. 7 is front view diagrammatic illustrating roller devices having tworoller bearings at respective ends.

FIG. 8 is a side view of an agricultural system having a leadingresidue-clearing sub-assembly, a trailing tillage anddepth-control-subassembly, and a roller device.

FIG. 9 is a perspective view of the agricultural system of FIG. 8.

FIG. 10 is a top view of the agricultural system of FIG. 8.

DETAILED DESCRIPTION OF ILLUSTRATED EMBODIMENTS

Although the invention will be described in connection with certainpreferred embodiments, it will be understood that the invention is notlimited to those particular embodiments. On the contrary, the inventionis intended to cover all alternatives, modifications, and equivalentarrangements as may be included within the spirit and scope of theinvention as defined by the appended claims.

Turning now to the drawings and referring first to FIGS. 1 and 2A, anagricultural system 100 includes a tow bar 102 for attachment to atowing vehicle, such as a tractor. The tow bar 102 is in a trailingposition relative to a direction of movement V (see FIG. 2A) along afield 130 and includes a row unit 103 a.

The row unit 103 a includes a row-cleaning device 104 and a rigid frame106 for attachment to the tow bar 102 The row-cleaning device 104includes a leading coulter 108 and a pair of furrow-opener disks 110that are attached in a trailing position relative to the leading coulter108, each of the furrow-opener disks 110 having a leading edge 110 aadjacent to a trailing edge 108 a of the leading coulter 108. Only oneof the furrow-opener disks 110 is visible in FIG. 1, with the second ofthe furrow-opener disks 110 being visible in FIG. 2A.

More specifically, the furrow-opener disks 110 have the respectiveleading edges 110 a adjacent to each other and near the trailing edge108 a of the leading coulter 108. The leading coulter 108 is positionedsuch that the leading edges 110 a of the two furrow-opener disks 110 areobscured by the trailing edge 108 a of the leading coulter 108 from afront farming position. The front farming position is forward of therow-cleaning device 104 along the direction of movement V along thefield 130.

The row-cleaning device 104 is attached to the agricultural system 100in a respective strip position B of a plurality of parallel strippositions along the tow bar 102. As further illustrated in FIG. 4, anddescribed in more detail below, the parallel strip positions include atleast the strip positions A-D.

A pivotable row-cleaning linkage 112 is attached to the rigid frame 106.The leading coulter 108 and the furrow-opener disks 110 are coupled tothe rigid frame 106 via the pivotable row-cleaning linkage 112.Additionally, a supplemental force for up-down movement is provided viaa row-cleaning actuator 113. The row-cleaning linkage 112 is a parallellinkage according to one exemplary embodiment.

A first roller device 114 a has a first end 116 a and a second end 118a. The first end 116 a is attached to the rigid frame 106 via apivotable roller linkage 120. More specifically, the first end 116 a isdirectly attached to a separator frame 121, which, in turn, is attachedto the roller linkage 120. The second end 118 a is attached in a similarmanner as the first end 116 a, near the parallel strip position A,illustrated in FIG. 2A, and to an adjacent rigid frame via anotherpivotable roller linkage. The roller linkage 120 is independentlymovable relative to the row-cleaning linkage 112 and, according to anexemplary embodiment, is a parallel linkage.

A second roller device 114 b has a first end 116 b and a second end 118b. The second roller device 114 b is attached similarly to the firstroller device 114 a, with the first end 116 b being attached to anopposite side of the separator frame 121, for indirect attachment to therigid frame 106 via the roller linkage 120. The second end 118 b of thesecond roller device 114 b is near a respective parallel strip positionC, illustrated in FIG. 4, and attached to an adjacent rigid frame viaanother pivotable roller linkage.

Each of the roller devices 114 a, 114 b includes a plurality of rollerprotrusions 128 that extend outwardly from a peripheral surface of therespective roller device 114 a, 114 b. The roller protrusions 128 areattached, for example, to the respective peripheral surface via weldingor mechanical fasteners. One advantage of the roller protrusions 128 isdirected to reducing the amount of force required to crush residualplant matter, based on the reduction of surface area of contact surfacesbetween the roller devices 114 a, 114 b and residual plant matter.Alternatively, the roller protrusions 128 are integrally formed from asingle piece of material, for example, by machining the roller devices114 a, 114 b with the roller protrusions 128 in a unitary construction.Alternatively yet, the roller devices 114 a, 114 b lack any rollerprotrusions 128 and are generally cylindrically shaped segments withsubstantially smooth surfaces.

The roller devices 114 a, 114 b are generally cylindrically shaped witha hollow (or partially hollow) interior 129 through which a supportingaxle is mounted (as illustrated in FIGS. 6 and 7) for supporting therotational motion of the roller devices 114 a, 114 b. In alternativeexamples, the roller devices 114 a, 114 b are solid cylinders, with acentral hole for accommodating the supporting axle, or partially hollowcylinders. Added material in the hollow interior 129 increase the weightand strength of the roller devices 114 a, 114 b to further increase thecrushing capability of the roller devices 114 a, 114 b. Less material inthe hollow interior 129 increase the flexibility of the roller devices114 a, 114 b to move past terrain obstacles when encountered in thefield 130.

In the illustrated embodiment, the roller devices 114 a, 114 b aremounted in a trailing position relative to the row-cleaning device 104.However, in an alternative embodiment the roller devices 114 a, 114 bare mounted in a forward position relative to the row-cleaning device104.

In yet other alternative embodiments, at least one of the roller devices114 a, 114 b is a crimping device attached to an agricultural devicehaving one or more separators. The crimping device is described in moredetail in U.S. Patent Application Publication No. 2013/0000535 toCharles H. Martin and Dominic R. Martin, titled “Agricultural FieldPreparation Device,” published on Jan. 3, 2013, and which is hereinincorporated by reference in its entirety.

The agricultural system 100 is movable in a direction V along a field130 in which standing residual plant matter 132 forward of therow-cleaning device 104 is leveled by the roller device 114 a intocrushed residual plant matter 134. The residual plant matter, such assmall grain cover crop, can include (for example) barley, wheat, oats,spelt, rye, clover, weeds, etc.

The cover crops are typically planted after a primary crop has beenharvested, such as corn, in order to reduce compaction of the soil. Thetype of field preparation that typically occurs simultaneously withcrushing of the standing residual plant matter 132 is typically plantingof a primary crop, such as corn. However, the agricultural system 100 isnot limited to planting, and may include spreading fertilizer or othertype of field preparation associated with “no-till” or other types ofreduced tillage techniques, such as strip-tilling, if desired.

Referring to FIG. 2B, the agricultural system 100 is configured toinclude a mini-roller device 115, instead of the row-cleaning device104. The mini-roller device 115 is sufficiently large to cover thesurface area that would otherwise be strip B. As such, the mini-rollerdevice 115, together with the first and second roller devices 114 a, 114b, level and crush the standing residual plant matter 132 forward of themini-roller device 115 without creating a strip between the first andsecond roller devices 114 a, 114 b. Instead, a single patch of crushedresidual plant matter 134 is formed behind the agricultural system 100.

The mini-roller device 115 can be a miniature version of the rollerdevice 114 a, being attached to the row-cleaning linkage 112 (instead ofthe leading coulter 108 and the furrow-opener disks 110). Optionally,the mini-roller device 115 can be any size that sufficiently covers thesurface area otherwise left uncovered between the first and secondroller devices 114 a, 114 b.

Referring to FIG. 3, the roller linkage 120 includes a pair of parallellinks 123 pivotably coupled between the rigid frame 106 and theseparator frame 123. Pivotable movement of the parallel links 121 allowsup-down movement of the roller device 114 a relative to the ground. Morespecifically, in this example the up-down movement is achieved inresponse to an actuator force provided by a roller actuator 125.

The roller actuator 125 has a movable piston end 127 mounted to theseparator frame 123 and a fixed end 129 mounted to the rigid frame 106.According to some examples, the roller actuator 125 is a hydraulicactuator or a pneumatic actuator. The force and movement of the rolleractuator 125 and the roller linkage 120, relative to the rigid frame106, is achieved independently of the row-cleaning linkage 112.

A roller actuator 125 is coupled at each end of a respective rollerdevice, such as the first end 116 b and the second end 118 b of thesecond roller device 114 b illustrated in FIG. 4. Thus, each row unit,such as row units 103 a, 103 b illustrated in FIG. 4, has at least onerespective roller actuator 125.

Referring to FIG. 4, the agricultural system 100 is illustrated havingtwo adjacent row units 103 a, 103 b, mounted along the tow bar 102 atrespective parallel strip positions B and C. Although not illustrated,similar or identical row units can be mounted along the tow bar 102 atstrip positions A and D. Each of the row units 103 a, 103 b includes arespective rigid frame 106 and roller linkage 120. Three roller devices,including the first roller device 114 a, the second roller device 114 b,and a third roller device are 103 c extend from and between respectiveones of the row units 103 a, 103 b.

For example, the second roller device 114 b extends between a first rowunit 103 a and a second row unit 103 b. The first roller device 114 aextends between the first row unit 103 a and an adjacent row unit thatis mounted (but not shown) along the tow bar 102 at the strip positionA. The third roller device 103 c extends between the second row unit 103b and an adjacent row unit that is mounted (but not shown) along the towbar 102 at the strip position D. The row units at strip positions A andD are similar and/or identical to the first and second row units 103 a,103 b.

Referring to FIG. 5, the row-cleaning device 104, including the leadingcoulter 108 and the furrow-opener disk 110, prepares exposed soil in thestrip position B for an agricultural operation, such as planting. Theroller device 114 a crushes, at least in part, the stems of the standingresidual plant matter 132 while maintaining the strip A of exposed soil.Alternatively, the roller device 114 a is positioned in a forwardposition relative to the row-cleaning device 104, instead of being inthe illustrated positioned rearward relative to the row-cleaning device104.

Furthermore, as the agricultural system 100 advance in the direction Valong the field 130, the row-cleaning device 104 moves up-downindependent of the roller device 114 a because each is independentlyattached to and actuated from the rigid frame 106. The roller device 114a moves pivotably and is actuated in response to a supplemental forceprovided by the roller actuator 125, as described above in reference toFIG. 3. In reference to the row-cleaning device 104, the row-cleaninglinkage 112 is similarly pivotably attached to the rigid frame 106 andis actuated in response to a supplemental force provided by therow-cleaning actuator 113. Thus, as the row-cleaning device 104 and theroller device 114 a encounter different field irregularities orobstacles, such as rocks, irregular terrain surfaces, and/or otherdebris, the row-cleaning device 104 and the roller device 114 a can beindependently adjusted to be positioned at a desired distance from thefield irregularity and to apply a desired force to the fieldirregularity (e.g., a lower force if a rock is encountered, a greaterforce if hardened soil is encountered, etc.).

The row-cleaning actuator 113 is coupled between the row-cleaninglinkage 112 and the rigid frame 106 to provide the desired supplementalforce to the respective. The row-cleaning actuator 113, by way ofexample, is a hydraulic or pneumatic actuator.

One benefit of the agricultural system 100, in which the row-cleaningdevice 104 is combined with the roller device 114 a is directed topreparing in a single pas strips of soil despite the presence ofstanding residual plant matter 132 in the field 130. Such agriculturalactions like separating residual plant matter 132, crushing stems of theresidual plant matter 132, and planting seeds in an open furrow of thestrips, all occur within the same pass of the agricultural system 100.

Additional benefits of the agricultural system 100 are directed to thecrushed residual plant matter 132. For example, the crushed residualplant matter 134 is effectively terminated or destroyed and remains incontact or in close proximity with the surface of the soil, returningnutrients to the soil, such as nitrogen, and thereby reducing the amountof fertilizer that must be subsequently applied to grow the primarycrop. In another example, the crushed residual plant matter 132 remainsin contact with or in close proximity with the surface of the soil helpsmaintain moisture in the soil. It has been shown that such increasedmoisture retention directly results in an increased yield of the primarycrop. In yet another example, by virtue of the crushed residual plantmatter 132 remaining in contact or in close proximity with the surfaceof the soil, a toxin is released as a result of which weed growth issubstantially diminished without (or reduced) application of herbicides.In yet another example, the presence of residual plant matter 132 orcover crop, by virtue of the root mass of the residual plant matter 132,significantly reduces soil erosion that would otherwise occur withoutsuch ground cover after harvest of the primary crop.

Referring to FIG. 6, the agricultural system 100 is configured withsingle, centrally located roller bearings 140 for roller devices 114a-114 d. The roller bearings 140 are centrally located along a centralaxle 142 within the hollow interior 129 of each roller device 114 a-14d. The central axle 142 represents a rotational axis along which theroller devices 114 a, 114 d rotate, respectively. The roller bearings140 are mounted to respective supporting brackets 143. As theagricultural system 100 is advanced along the field 130, the row units103 a-103 c independently move up-and-down when obstacles, such as arock 144, are encountered.

For example, the first row unit 103 a moves up to advance past the rock144 when the second roller device 114 b encounters the rock 144. Therock 144 causes the second roller device 114 b to flex upwards. Thesecond roller device 114 b pivots about the central roller bearing 140and relative to the central axle 142, with the first end 116 b movingupwards and the second end 118 b moving downwards. The movement of thesecond roller device 114 b causes movement of the first row unit 103 a,which, in turn, causes movement of the first roller device 114 a. Thefirst roller device 114 a, similar to the second roller device 114 b,pivots about its central roller bearing and relative to its central axle142, with the first end 116 a moving upwards and the second end 118 amoving downwards. The second and third row units 103 b, 103 c, and thethird and fourth roller devices 114 c, 114 d remain generally unaffectedby the movement of the first row unit 103 a and the first and secondroller devices 114 a, 114 b.

Optionally, instead of a single roller bearing 140, two roller bearingsare centrally located along one or more of the roller devices 114 a-114d. Each of the two roller bearings is mounted on a respective, oppositeside of the supporting bracket 143.

Referring to FIG. 7, the agricultural system 100 illustrated in FIG. 6is alternatively configured with two roller bearings 140 at respectiveends of the roller devices 114 a-114 d. Thus, instead of a single,centrally located, roller bearing 140, two side roller bearings 140 areprovided for each of the roller devices 114 a-114 d. Each of the sideroller bearing 140 is mounted along the central axle 142 to a supportingbracket 143. Optionally, for increased flexibility in pivoting movement,two side roller bearings 140 are mounted at each end of one or more ofthe roller devices 114 a-114 d.

Referring to FIG. 8, an agricultural system 200 includes a row unit 201with a leading residue-clearing sub-assembly 202 followed by a trailingtillage and depth-control sub-assembly 204. Both sub-assemblies 202, 204are carried by a common frame 206 attached to a rear end of a four-barlinkage assembly 208, which, in turn, is attached to a front frame 210.The front frame 210 is adapted to be connected to the tow bar 102 of atowing vehicle. The agricultural system 200 is movable in a direction Valong the field 130. Because both sub-assemblies 202, 204 are carried bythe same frame 206, the relative relationship of all the components ofthe two sub-assemblies 202, 204 remains fixed so that they maintain aconsistent set of dynamic properties governed by their relative sizesand positions rather than just the individual properties of theindividual components.

The residue-clearing sub-assembly 202 includes a forward coulter wheel220 flanked by a pair of toothed wheels 222, 223 overlapping a rear edgeportion of the forward coulter wheel 220. Thus, the residue-clearingsub-assembly 202 is similar, but necessarily identical, to therow-cleaning device 104. The forward coulter wheel 220 cuts through theresidue on the soil, such as stalks from a previous year's planting, andcuts a shallow slit in the soil. The trailing toothed residue-clearingwheels 222, 223 then kick the cut residue off to opposite sides of theslit cut by the forward coulter wheel 220, thus clearing a row forplanting (e.g., strip rows A-C illustrated in FIG. 1), while at the sametime cleaning the forward coulter wheel 220. To this end, the frontedges of the toothed wheels 222, 223 are tilted inwardly toward thevertical plane of the forward coulter wheel 220 to assist in cleaningthe forward coulter wheel 220, and the lower edges are tilted outwardlyto assist in cleaning the row to be planted. This arrangement isparticularly well suited for strip tilling, where the strip cleared forplanting is typically only about 10 inches of the 30-inchcenter-to-center spacing between planted rows.

The tillage and depth-control sub-assembly 204 includes a pair ofrearward coulter wheels 230, 231 that are offset from each other bothlaterally and fore and aft, and two gauge wheels 232, 233. The rearedges of the rearward coulter wheels 230, 231 are tilted inwardly towardthe slit cut by the forward coulter wheel 220, and the lower edges ofthe rearward coulter wheels 230, 213 are tilted outwardly away from theslit. Thus, each of the rearward coulter wheels 230, 231 makes contactwith the soil at an angle in two planes, causing each of the rearwardcoulter wheels 230, 231 to apply a force to the soil that is upward andtoward the center of the row. The aggregate effect of this angularrelationship on the soil is a turbulent swirling and mixing of the soilin the space between the two rearward coulter wheels 230, 231. Theturbulent swirling and mixing of the soil incorporates air and residueinto the soil, and, further, breaks the soil into finer pieces. Soilthrown laterally by the leading coulter wheel 230 is caught by thetrailing coulter wheel 231 to retain that soil in the tilled areabetween the two rearward coulter wheels 230, 231 and to form a ridge forplanting.

The gauge wheels 232, 233 control the depth to which the row unit 201penetrates into the soil, and also intercept soil and residue thrownupwardly and laterally by the trailing coulter wheel 231, to retain thatsoil in the strip being tilled. This prevents soil loss form the tilledarea and facilitates the creation of the ridge, or berm, which isdesirable for planting. Because the height of the axes of rotation ofall the wheels 220, 222, 223, 230, 231 is fixed relative to the heightof the axes of rotation of the gauge wheels 232, 233, the interactionamong all the wheels remains essentially the same at all times.Alternatively, instead of gauge wheels, the row unit 201 includessmall-belted caterpillar tracks or similar devices for controlling thedepth.

Each of the gauge wheels 232, 233 includes a swirl device 240 havingmultiple tines 242 and being attached to a central portion of theinboard side of each respective gauge wheel 232, 233. As such, the swirldevice 240 is located rearwardly of the of the tillage device (e.g.,rearward coulter wheels 230, 231) and is positioned to intercept soiland residue displaced upwardly by the tillage device. The swirl device240 rotates with the respective gauge wheel 232, 233 and helps tocontrol the distribution of soil moving toward the respective gaugewheel 232, 233 from the rearmost of the coulter wheels 220, 230, 231.

The swirl device 240 intercepts a portion of the soil and residue thrownupwardly and laterally towards the gauge wheels 232, 233 by the trailingcoulter wheel 231 and distributes the intercepted soil and residueacross the tilled strip adjacent the gauge wheels 232, 233. The swirldevice 240 also helps to break up clumpy soil. Because the outsidediameter of the swirl device 240 is smaller than the outside diameter ofthe gauge wheels 232, 233, the swirl device 240 operates above groundlevel and does not dig into the earth. Another benefit of the swirldevice 240 is that it produces thorough incorporation of fertilizer,especially dry fertilizer, with the soil within the worked strip whereit is needed by the plants, rather than leaving the fertilizer inconcentrated ribbons. This allows the application of more fertilizer inthe strip, possibly just ahead of the planter by a few hours, withoutburning the seed, and may eliminate a second trip to side dress. Thetotal amount of fertilizer applied to produce optimum crop yields mayeven be reduced. Fertilizer that is not thoroughly incorporated in thesoil may be lost to the atmosphere or runoff, which is costly and maypollute both ground water and surface water.

In the embodiment described above, all the coulter wheels 220, 230, 231are corrugated or fluted coulter wheels, but a wide variety of differentcoulter wheels are well known in the agricultural industry, and any ofthem may be used. The same is true of the toothed residue-clearingwheels 222, 223—a wide variety of different configurations of toothedwheels are well known in the agricultural industry for residue clearing,and any of them may be used.

The illustrative row unit 201 is urged downwardly against the soil byits own weight. If it is desired to have the ability to increase thisdownward force, or to be able to adjust the force, a hydraulic orpneumatic cylinder and/or one or more springs may be added between thecommon frame 206 and the four-bar linkage assembly 208, or between thecommon frame 206 and the front frame 210, to urge the common frame 206downwardly with a controllable force. Such a hydraulic cylinder may alsobe used to lift the row unit off the ground for transport by a heavier,stronger, fixed-height frame that is also used to transport largequantities of fertilizer for application via multiple residue-clearingand tillage row units.

The agricultural system 200 further includes a roller device 250 that ismounted for crushing residual plant matter. The configuration and/orattachment of the roller device 250 is similar to and/or identical tothe roller devices 114 a-114 d described above in reference to FIGS.1-7. In the illustrated embodiment of FIG. 8, the roller device 250 isin a trailing position relative to the forward coulter wheel 220.However, in alternative embodiments the roller device 250 is positionedin other desired positions relative to the forward coulter wheel 220.

Referring to FIGS. 9 and 10, the agricultural system 200 includes tworoller devices 250 a, 250 b extending in-between three row units 201a-201 c. As the agricultural system 200 is advanced in direction V alongthe field 103, the roller devices 250 a, 250 b level standing residualplant matter 132 into crushed residual plant matter 134. Simultaneously,the row units 201 a-201 c prepare strips of soil A-C in preparation forplanting or other farming operation.

In alternative embodiments one or more of the wheels described above areforged blades with an induction hardened edge. The forged blades arebeneficial because they are ductile and, as such, are not prone toshatter. Furthermore, in addition to being resisting to shattering, theforged blades maintain a hardened edge. In a further optionalembodiment, one or more of the coulters described above is made of castiron and includes a beveled edge.

In other alternative embodiments, various hydraulic configurations areincluded in one or more of the agricultural systems 100, 200. Forexample, hydraulic cylinders are mounted to any movable components ofthe agricultural systems 100, 200 in which a controllable down/uppressure is desired for maintaining a required component-to-groundpressure.

It will be evident to those skilled in the art that the invention is notlimited to the details of the foregoing illustrated embodiment and thatthe present invention may be embodied in other specific forms withoutdeparting from the spirit or essential attributes thereof. The presentembodiment is therefore to be considered in all respects as illustrativeand not restrictive, the scope of the invention being indicated by theappended claims rather than by the foregoing description, and allchanges which come within the meaning and range of equivalency of theclaims are therefore intended to be embraced therein.

The invention claimed is:
 1. An agricultural system comprising: a towbar for attachment to a towing vehicle in a trailing position relativeto a direction of movement along a field; a plurality of row-cleaningdevices attached in parallel strip positions along the tow bar, eachrow-cleaning device of the plurality of row-cleaning devices including arigid frame for attachment to the tow bar, a leading coulter, one ormore furrow-opener disks in a trailing position relative to the leadingcoulter, each of the one or more furrow-opener disks having a leadingedge adjacent to a trailing edge of the leading coulter, and a pivotablerow-cleaning linkage attached to the rigid frame, the leading coulterand the furrow-opener disks being coupled to the rigid frame via thepivotable row-cleaning linkage; and at least one roller device extendingbetween two adjacent parallel strip positions and being attached at eachend to a respective rigid frame via a respective pivotable rollerlinkage, the pivotable roller linkage being independently movablerelative to the pivotable row-cleaning linkage.
 2. The agriculturalsystem of claim 1, wherein the at least one roller device is in aleading position relative to the plurality of row-cleaning devices. 3.The agricultural system of claim 1, wherein the at least one rollerdevice is in a trailing position relative to the plurality ofrow-cleaning devices.
 4. The agricultural system of claim 1, wherein atleast one of the leading coulter and the one or more furrow-opener disksis a forged blade with an induction hardened edge.
 5. The agriculturalsystem of claim 1, further comprising an actuator coupled between thepivotable row-cleaning linkage and the rigid frame, the actuatorapplying a force to the row-cleaning device.
 6. The agricultural systemof claim 5, wherein the actuator is a hydraulic actuator and the forceis a controllable down-force.
 7. The agricultural system of claim 1,further comprising an actuator coupled at each end of the roller device,between the respective rigid frame and the respective pivotable rollerlinkage, the actuator applying a force to a respective end of the rollerdevice.
 8. The agricultural system of claim 7, wherein the actuator is ahydraulic actuator and the force is a controllable down-force.
 9. Theagricultural system of claim 1, wherein the leading edge of the one ormore furrow-opener disks is overlapping with the trailing edge of theleading coulter.
 10. The agricultural system of claim 1, wherein the oneor more furrow-opener disks includes two furrow-opener disks withrespective leading edges adjacent to each other near the trailing edgeof the leading coulter, the leading coulter being positioned such thatthe leading edges of the two furrow-opener disks are obscured by thetrailing edge of the leading coulter from a front farming position, thefront farming position being forward of the row-cleaning device alongthe direction of movement along the field.
 11. An agricultural systemcomprising: a tow bar for attachment to a towing vehicle in a trailingposition relative to a direction of movement along a field; a pluralityof row-cleaning devices attached in parallel strip positions along thetow bar, the plurality of row-cleaning devices including a firstrow-cleaning device and a second row-cleaning device, the firstrow-cleaning device being attached in a first strip position andincluding a first rigid frame for attachment to the tow bar, a firstleading coulter, one or more first furrow-opener disks in a trailingposition relative to the first leading coulter, and a first pivotablerow-cleaning linkage attached to the first rigid frame, the firstleading coulter and the first furrow-opener disks being coupled to thefirst rigid frame via the first pivotable row-cleaning linkage; thesecond row-cleaning device being attached in a second strip position,the second strip position being adjacent and parallel to the first stripposition, the second row-cleaning device including a second rigid framefor attachment to the tow bar, a second leading coulter, one or moresecond furrow-opener disks in a trailing position relative to the secondleading coulter, and a second pivotable row-cleaning linkage attached tothe second rigid frame, the second leading coulter and the secondfurrow-opener disks being coupled to the second rigid frame via thesecond pivotable row-cleaning linkage; and a roller device attachedbetween the first row-cleaning device and the second row-cleaningdevice, the roller device including a first pivotable roller linkageattached at a first end of the roller device and being independentlymovable from the first rigid frame, a second pivotable roller linkageattached at a second end of the roller device and being independentlymovable from the second rigid frame, and at least one roller bearingmounted along a rotational axis of the roller device.
 12. Theagricultural system of claim 11, wherein the at least one roller bearingis a single roller bearing mounted at a central location between thefirst strip position and the second strip position.
 13. The agriculturalsystem of claim 11, wherein the at least one roller bearing includes afirst roller bearing and a second roller bearing, the first rollerbearing being mounted near the first end of the roller device, thesecond roller bearing being mounted near the second end of the rollerdevice.
 14. The agricultural system of claim 11, wherein the rollerdevice is in a leading position relative to the plurality ofrow-cleaning devices.
 15. The agricultural system of claim 11, whereinthe roller device is in a trailing position relative to the plurality ofrow-cleaning devices.
 16. The agricultural system of claim 11, furthercomprising an actuator coupled mounted to at least one of the pluralityof row-cleaning devices, the actuator applying a force to a respectiverow-cleaning device of the plurality of row-cleaning devices.
 17. Theagricultural system of claim 16, wherein the actuator is a hydraulicactuator and the force is a controllable down-force.
 18. Theagricultural system of claim 11, further comprising: a first actuatorcoupled at the first end of the roller device between the first rigidframe and the first pivotable roller linkage, the first actuatorapplying a first force to the first end of the roller device; and asecond actuator coupled at the second end of the roller device betweenthe second rigid frame and the second pivotable roller linkage, thesecond actuator applying a second force to the second end of the rollerdevice.
 19. The agricultural system of claim 18, wherein at least one ofthe first actuator and the second actuator is a hydraulic actuatorapplying a controllable down-force.
 20. The agricultural system of claim11, wherein at least one of the first leading coulter, the one or morefirst furrow-opener disks, the second leading coulter, and the one ormore second furrow-opener is a forged blade with an induction hardenededge.